Interactive effect of cytokinin and potassium on sink-source relationships in Lupinus angustifolius

F-H. Liu, Nancy Longnecker

    Research output: Contribution to journalArticle

    4 Citations (Scopus)

    Abstract

    This study examined whether increased K supply in conjunction with BAP could increase lupin seed yield and harvest index by enlarging sink volume (pod number), increasing assimilate and improving assimilate partitioning to fill the additional pods induced by BAP treatment. Narrow-leafed lupin (Lupinus angustifolius, cv. Danja abs(-) mutant) was grown in a glasshouse, in pots containing sandy soil with four K treatments (0, 15, 60 and 120 mg K/kg soil). BAP (2 mM) was applied daily to all main stem flowers throughout the life of each flower from opening to senesced. BAP application did not affect assimilate production (as measured by total above-ground biomass), but changed assimilate partitioning. On BAP-treated plants, there were greater proportions of seed to pod wall dry weight on the main stem but smaller proportions on the branches, and an increased weight ratio of seed to pod wall overall which meant more assimilate was used for seed growth rather than pod wall growth. BAP increased the number of pods per plant by 35% and this more than compensated for the decreases in seeds per pod and seed weight. Therefore, there was an increased harvest index (+11%) and seed yield per plant (+13%) in BAP-treated plants. BAP also increased the number of pods with filled seeds (146%) on the main stem and main stem seed K+ concentration (from 0.81% to 0.87%). Added K increased biomass but only slightly affected assimilate partitioning. As applied K increased, relatively more assimilate was used for pod wall growth rather than seed growth. Added K increased seed yield per plant by about 14% due to increases in seed weight and the number of pods on the main stem. Moreover, K+ concentration in seeds and shoots increased with increasing level of applied K. Seed yield was enhanced more by BAP when K was supplied at high levels. Increasing K supply interacted positively with added BAP by increasing narrow-leaf lupin seed yield and harvest index through increases in assimilate supply and its partitioning into seeds.
    Original languageEnglish
    Pages (from-to)1-6
    JournalPlant Growth Regulation
    Volume36
    DOIs
    Publication statusPublished - 2002

    Fingerprint

    Lupinus
    source-sink relationships
    Cytokinins
    Lupinus angustifolius
    cytokinins
    Seeds
    Potassium
    pods
    potassium
    seeds
    seed yield
    harvest index
    stems
    Weights and Measures
    Growth
    Biomass
    flowers
    Soil
    branches
    aboveground biomass

    Cite this

    @article{9d5ab1429b0d40338e376701a45f99a0,
    title = "Interactive effect of cytokinin and potassium on sink-source relationships in Lupinus angustifolius",
    abstract = "This study examined whether increased K supply in conjunction with BAP could increase lupin seed yield and harvest index by enlarging sink volume (pod number), increasing assimilate and improving assimilate partitioning to fill the additional pods induced by BAP treatment. Narrow-leafed lupin (Lupinus angustifolius, cv. Danja abs(-) mutant) was grown in a glasshouse, in pots containing sandy soil with four K treatments (0, 15, 60 and 120 mg K/kg soil). BAP (2 mM) was applied daily to all main stem flowers throughout the life of each flower from opening to senesced. BAP application did not affect assimilate production (as measured by total above-ground biomass), but changed assimilate partitioning. On BAP-treated plants, there were greater proportions of seed to pod wall dry weight on the main stem but smaller proportions on the branches, and an increased weight ratio of seed to pod wall overall which meant more assimilate was used for seed growth rather than pod wall growth. BAP increased the number of pods per plant by 35{\%} and this more than compensated for the decreases in seeds per pod and seed weight. Therefore, there was an increased harvest index (+11{\%}) and seed yield per plant (+13{\%}) in BAP-treated plants. BAP also increased the number of pods with filled seeds (146{\%}) on the main stem and main stem seed K+ concentration (from 0.81{\%} to 0.87{\%}). Added K increased biomass but only slightly affected assimilate partitioning. As applied K increased, relatively more assimilate was used for pod wall growth rather than seed growth. Added K increased seed yield per plant by about 14{\%} due to increases in seed weight and the number of pods on the main stem. Moreover, K+ concentration in seeds and shoots increased with increasing level of applied K. Seed yield was enhanced more by BAP when K was supplied at high levels. Increasing K supply interacted positively with added BAP by increasing narrow-leaf lupin seed yield and harvest index through increases in assimilate supply and its partitioning into seeds.",
    author = "F-H. Liu and Nancy Longnecker",
    year = "2002",
    doi = "10.1023/A:1014794015080",
    language = "English",
    volume = "36",
    pages = "1--6",
    journal = "Plant Growth Regulation",
    issn = "0167-6903",
    publisher = "Springer",

    }

    Interactive effect of cytokinin and potassium on sink-source relationships in Lupinus angustifolius. / Liu, F-H.; Longnecker, Nancy.

    In: Plant Growth Regulation, Vol. 36, 2002, p. 1-6.

    Research output: Contribution to journalArticle

    TY - JOUR

    T1 - Interactive effect of cytokinin and potassium on sink-source relationships in Lupinus angustifolius

    AU - Liu, F-H.

    AU - Longnecker, Nancy

    PY - 2002

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    N2 - This study examined whether increased K supply in conjunction with BAP could increase lupin seed yield and harvest index by enlarging sink volume (pod number), increasing assimilate and improving assimilate partitioning to fill the additional pods induced by BAP treatment. Narrow-leafed lupin (Lupinus angustifolius, cv. Danja abs(-) mutant) was grown in a glasshouse, in pots containing sandy soil with four K treatments (0, 15, 60 and 120 mg K/kg soil). BAP (2 mM) was applied daily to all main stem flowers throughout the life of each flower from opening to senesced. BAP application did not affect assimilate production (as measured by total above-ground biomass), but changed assimilate partitioning. On BAP-treated plants, there were greater proportions of seed to pod wall dry weight on the main stem but smaller proportions on the branches, and an increased weight ratio of seed to pod wall overall which meant more assimilate was used for seed growth rather than pod wall growth. BAP increased the number of pods per plant by 35% and this more than compensated for the decreases in seeds per pod and seed weight. Therefore, there was an increased harvest index (+11%) and seed yield per plant (+13%) in BAP-treated plants. BAP also increased the number of pods with filled seeds (146%) on the main stem and main stem seed K+ concentration (from 0.81% to 0.87%). Added K increased biomass but only slightly affected assimilate partitioning. As applied K increased, relatively more assimilate was used for pod wall growth rather than seed growth. Added K increased seed yield per plant by about 14% due to increases in seed weight and the number of pods on the main stem. Moreover, K+ concentration in seeds and shoots increased with increasing level of applied K. Seed yield was enhanced more by BAP when K was supplied at high levels. Increasing K supply interacted positively with added BAP by increasing narrow-leaf lupin seed yield and harvest index through increases in assimilate supply and its partitioning into seeds.

    AB - This study examined whether increased K supply in conjunction with BAP could increase lupin seed yield and harvest index by enlarging sink volume (pod number), increasing assimilate and improving assimilate partitioning to fill the additional pods induced by BAP treatment. Narrow-leafed lupin (Lupinus angustifolius, cv. Danja abs(-) mutant) was grown in a glasshouse, in pots containing sandy soil with four K treatments (0, 15, 60 and 120 mg K/kg soil). BAP (2 mM) was applied daily to all main stem flowers throughout the life of each flower from opening to senesced. BAP application did not affect assimilate production (as measured by total above-ground biomass), but changed assimilate partitioning. On BAP-treated plants, there were greater proportions of seed to pod wall dry weight on the main stem but smaller proportions on the branches, and an increased weight ratio of seed to pod wall overall which meant more assimilate was used for seed growth rather than pod wall growth. BAP increased the number of pods per plant by 35% and this more than compensated for the decreases in seeds per pod and seed weight. Therefore, there was an increased harvest index (+11%) and seed yield per plant (+13%) in BAP-treated plants. BAP also increased the number of pods with filled seeds (146%) on the main stem and main stem seed K+ concentration (from 0.81% to 0.87%). Added K increased biomass but only slightly affected assimilate partitioning. As applied K increased, relatively more assimilate was used for pod wall growth rather than seed growth. Added K increased seed yield per plant by about 14% due to increases in seed weight and the number of pods on the main stem. Moreover, K+ concentration in seeds and shoots increased with increasing level of applied K. Seed yield was enhanced more by BAP when K was supplied at high levels. Increasing K supply interacted positively with added BAP by increasing narrow-leaf lupin seed yield and harvest index through increases in assimilate supply and its partitioning into seeds.

    U2 - 10.1023/A:1014794015080

    DO - 10.1023/A:1014794015080

    M3 - Article

    VL - 36

    SP - 1

    EP - 6

    JO - Plant Growth Regulation

    JF - Plant Growth Regulation

    SN - 0167-6903

    ER -